csharp

C# / .NET Rules

Style

• Match existing style: file-scoped namespaces vs block, var vs explicit types.
• Match existing nullable-reference convention (#nullable enable or not).
• Match existing async naming (Async suffix).
• Don't reformat unrelated lines.

Output

• Single method change → show only the method.
• Class change → show only the changed members. Use // ... rest of class unchanged.
• Don't reprint using directives unless adding new ones.

Async

• Don't convert sync methods to async unless asked.
• Match existing ConfigureAwait(false) usage exactly.
• Don't introduce Task.Run to make sync code "look async".

LINQ vs Loops

• Match existing style. Don't rewrite a foreach as LINQ unless asked.
• Don't add .ToList() unless required for materialization.

DI / Patterns

• Don't add new abstractions (interfaces, factories) unless the codebase uses them.
• Don't change DI container registrations as a side-effect of a feature.

ASP.NET / EF

• Match existing API style: minimal APIs vs controllers.
• Match existing EF tracking style; don't add .AsNoTracking() unless the existing code does.
• Don't change connection strings or appsettings.json schema unless asked.

Never

• Don't add partial class declarations unless asked.
• Don't introduce dynamic types.
• Don't add record types to a non-record codebase.
• Don't change internal ↔ public visibility unless asked.